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Pension Plans and Other Post Employment Benefit Plans Components of net periodic benefit cost (credit) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | May 31, 2019 | Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Funded Status |  | $ 5,800 |  | $ 5,800 |  |  |
Restricted Cash |  | 319 |  | 319 |  |  |
Discount rate |  |  |  |  |  | 3.64% | 4.23%
Defined Benefit Plan Remeasurement Impact Underfunded Status |  | 114 |  | 114 |  |  |
Pension Plan |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Service Cost |  | 12 | $ 36 | 32 | $ 72 |  |
Interest Cost |  | 199 | 190 | 407 | 381 |  |
Expected return on plan assets |  | (282) | (302) | (586) | (607) |  |
Amortization of unrecognized loss (gain) |  | 1 | (3) | 2 | (4) |  |
Curtailment/settlement (gain) loss |  | (1) | (4) | (1) | (4) |  |
Defined Benefit Plan, Net Periodic Benefit (Credit) Cost |  | (71) | (83) | (146) | (162) |  |
Other Benefit Plans |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Service Cost |  | 1 | 2 | 3 | 4 |  |
Interest Cost |  | 22 | 22 | 45 | 43 |  |
Amortization of unrecognized loss (gain) |  | (1) | 0 | (1) | 0 |  |
Discontinued Operations [Member] | Pension Plan |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit (Credit) Cost | [1] | (9) | (13) | (17) | (25) |  |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax |  | (16) | (27) | (37) | (54) |  |
Continuing Operations [Member] | Pension Plan |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit (Credit) Cost |  | (62) | (70) | (129) | (137) |  |
Continuing Operations [Member] | Other Benefit Plans |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit (Credit) Cost |  | $ 22 | $ 24 | $ 47 | $ 47 |  |
[1] | Includes non-service related components of net periodic benefit credit of $(16) million and $(37) million for the three and six months ended June 30, 2019, and $(27) million and $(54) million for the three and six months ended June 30, 2018, respectively.

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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